A new approach for analysis, modeling and simulation of brushless multiphase machines

This work shows a new approach for analysis, modeling and simulation of permanent magnet brushless DC machines in any simulation environment which integrates dynamics and control issues. The method is derived from three-phase electrical connection of equivalent sources with floating neutral and is expanded for a five phases brushless DC machine. It can be used for any machine with either sinusoidal or trapezoidal back-EMF waveforms as long as the neutral is compensated with injection of the imbalanced voltage. Analysis for three-phases as well as five-phases machines is presented and a closed loop torque controlled drive will demonstrate the operation in motoring and regenerative modes. Extensions to any number of phases and incorporation of freewheeling, mutual inductance and armature reaction can also be made